If the strain rate in a polymer can be represented

If the strain rate in a polymer can be represented by the following equation:
dε/dt = σ/η + (1/E) dσ/dt
Where ε = strain, σ = stress, η = viscosity, E = modulus of elasticity, and t = time, derive Equation 16-5, assuming constant strain (i.e., dε = 0). What is the relaxation time (λ) in Equation 16-5 a function of?

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